- published: 02 May 2011
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Portolan or portulan charts are navigational maps based on compass directions and estimated distances observed by the pilots at sea. They were first made in the 13th century in Italy, and later in Spain and Portugal, with later 15th and 16th century charts noted for their cartographic accuracy. With the advent of widespread competition among seagoing nations during the Age of Discovery, Portugal and Spain considered such maps to be state secrets. The English and Dutch relative newcomers found the description of Atlantic and Indian coastlines extremely valuable for their raiding, and later trading, ships. The word portolan comes from the Italian adjective portolano, meaning "related to ports or harbors", or "a collection of sailing directions".
Portolan maps all share the characteristic rhumbline networks, which emanate out from compass roses located at various points on the map. These better called "windrose lines" are generated by observation and the compass, and designate lines of bearing (though not to be confused with modern rhumblines and meridians).
Ahmed Muhiddin Piri (1465/70–1553), better known as Piri Reis (Turkish: Pîrî Reis or Hacı Ahmed Muhiddin Pîrî Bey), was an Ottoman admiral, geographer, and cartographer.
He is primarily known today for his maps and charts collected in his Kitab-ı Bahriye (Book of Navigation), a book that contains detailed information on navigation, as well as very accurate charts (for their time) describing the important ports and cities of the Mediterranean Sea. He gained fame as a cartographer when a small part of his first world map (prepared in 1513) was discovered in 1929 at the Topkapı Palace in Istanbul. His world map is the oldest known Turkish atlas showing the New World, and one of the oldest maps of America still in existence anywhere (the oldest known map of America that is still in existence is the map drawn by Juan de la Cosa in 1500). Piri Reis' map is centered on the Sahara at the latitude of the Tropic of Cancer.
In 1528, Piri Reis drew a second world map, of which a small fragment (showing Greenland and North America from Labrador and Newfoundland in the north to Florida, Cuba, Hispaniola, Jamaica and parts of Central America in the south) still survives. According to his imprinting text, he had drawn his maps using about 20 foreign charts and mappae mundi (Arab, Spanish, Portuguese, Chinese, Indian and Greek) including one by Christopher Columbus. He was executed in 1553.
Marguerite Ragnow is the Editor of Terrae Incognitae and curator at the James Ford Bell Library, University of Minnesota, USA. The Bell Library has a large collection of rare books, maps and manuscripts that focus on trade and cross-cultural interaction before ca. 1800. In this video, Marguerite introduces one of the library's Portolan charts. These are navigational maps made in the thirteenth, fourteenth and fifteenth centuries which were based on realistic descriptions of harbours and coasts and which recorded the accumulated experience and wisdom of generations of Mediterranean seafarers. The chart in the video includes all of Europe, extending to the Black and Red seas in the east, and shows Antilia at the western extreme. It was made by a Genoese cartographer, Albini de Canepa, and he...
Portolan or portulan charts are navigational maps based on compass directions and estimated distances observed by the pilots at sea.They were first made in the 13th century in Italy, and later in Spain and Portugal, with later 15th and 16th century charts noted for their cartographic accuracy.With the advent of widespread competition among seagoing nations during the Age of Discovery, Portugal and Spain considered such maps to be state secrets.The English and Dutch relative newcomers found the description of Atlantic and Indian coastlines extremely valuable for their raiding, and later trading, ships. ---Image-Copyright-and-Permission--- About the author(s): anonymous, probably Genoan License: Public domain ---Image-Copyright-and-Permission--- This channel is dedicated to make Wikipedia,...
Video orientation to LJS 28 - Agnese, Battista, 16th cent - [Portolan atlas]. Summary: 7 double-page navigational maps marked with place names and rhumb-lines. See more at Penn in Hand: http://hdl.library.upenn.edu/1017/d/medren/4845262
Dutch language presentation with Google translated sub-title about the mystery of the ancient Portolan maps used in the middle ages. As. dr. Nicolai explains: the mystery of the Portolan maps can only be examined in a scientific way. This is what he did over the last 11 years. But the mystery has even become bigger.
The "Rhumbline network" also called "Rhumbline grid" is a common characteristic of all portolans. This network is like a web , forming a grid on the map, which is a basic element of any portolan. The grid can be seen easily by looking the rear face of portolan, against a light source, as parchment is quite transparent. The hole in the center of the circle plot origin is also visible from the rear. Pujades in his book "Les cartes portolanes" has a chapter with all known theories and to clarify the controversial arguments he shows an image of Petrus Vesconte drawing a portolan in one of his map s in which it is visible how he started by drawing first the rhumbline grid. Some authors call it "winds network" instead of using the term "rhumbline network" or "network of rhumblines" The c...
lil jam during a hot summer day 2017 :)
"A Rare Portolan Atlas by Giovanni Battista Cavallini and the Cartographic Workshop in Livorno" Talk by Corradino Astengo (Session I - Maps and Charts as Repositories of Knowledge and Expressions of Power) at the 3rd International Scientific Conference of the Sylvia Ioannou Foundation, "Knowledge is Power", held on 2-4 November 2016 at the University of Cyprus.
خرائط الاميرال بيري رايس الدولة العثمانية Piri Reis Piri Reis (full name Hadji Muhiddin Piri Ibn Hadji Mehmed, Reis (Rais, Captain) (1465--1554) was an Ottoman-Turkish Kaptan (Captain), geographer and cartographer born between 1465 and 1470 in Gallipoli on the Aegean coast of Turkey. He is primarily known today for his maps and charts collected in his Kitab-ý Bahriye (Book of Navigation), a book which contains detailed information on navigation as well as extremely accurate charts describing the important ports and cities of the Mediterranean Sea. He gained fame as a cartographer when a small part of his first world map (prepared in 1513) was discovered in 1929 at Topkapý Palace in Istanbul. The most surprising aspect was the presence of the Americas on an Ottoman map, making it t...